Opamp as buffer with 1A output Current-Design Constraint

Thread Starter

hoyyoth

Joined Mar 21, 2020
142
Dear Team,

I need to use a buffer at the output of my voltage divider circuit.The buffer must have a maximum output current of 1A.
I checked many opamps with output current 1A or more. Their power supplies are starting from 7V.
I have only a 5V supply in hand. May I know any alternative way to implement this?.
Below is my circuit.
1630481872641.png

Regards
HARI
 

BobTPH

Joined Jun 5, 2013
3,828
It might be that you do not really need an opamp delivering 1A of current. If you would tell the characteristics of the signal source and the load, we might be able to find a better solution.

Bob
 

RPLaJeunesse

Joined Jul 29, 2018
184
It's possible to use a small op-amp and follow it with an NPN - PNP bipolar transistor cascade to get to 1A current sourced. But this approach will not sink any current, so the type of load is critical to circuit operation. Additionally the delay through the transistor pair could cause amplifier instability unless specific methods were added to keep the result stable.
 

Thread Starter

hoyyoth

Joined Mar 21, 2020
142
Dear Team,

Thank you for all your support.
The requirement got changed opamp with 250mA output current is enough.
Now this can be done easily.

Once again thanks for all your support.

Regards
HARI
 
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